TRUCK SERVICE MANUALTM 5-4210-230-14&P-1PROPELLER SHAFTLUBE SPECSDON'T NEGLECT DRIVE SHAFT LUBRICATIONLack of adequate or proper lubrication is among themost common causes of U-Joint and drive shaft failure!Proper servicing of the drive shaft is an essential part ofvehicle maintenance and should not be overlooked in routineshop procedure.UNIVERSAL JOINTSIN THE VEHICLE OR APPLICATIONTo insure proper lubrication of all four bearingassemblies on universal joints, it is essential that mechanicsadd lubricant until it appears at all journal cross bearing seals(Fig. 10). This assures removal of dirt particles and othercontaminants that may find their way into the bearings andindicates to the mechanic that the bearings are fullylubricated. Do not assume that bearing cavities have beenfilled with new lubricant unless flow is noticed around all fourbearing seals! Journal cross seals are designed to relieve.However, if all the seals do not "pop" when being lubed, movethe driveshaft laterally in all four directions and pull or push onthe drive shaft in the direction opposite to the journal crossseal not relieving while lube gun pressure is being applied tothe alemite fitting. An increase in line pressure may also benecessary.Fig. 10DRIVE SHAFT ASSEMBLYFactory assembled drive shafts are lubricated at theplant prior to shipment. However, shipping, handling andinstallation of the drive shaft assembly into the vehicle usuallyresults in some loss of lube. Therefore, it is recommendedthat all universal joints be relubricated after installation of thedrive shaft prior to putting vehicle in service.JOURNAL AND BEARING KITSReplacement universal joint kits contain only enoughgrease to provide needle bearing protection during storage. Itis therefore necessary to completely lubricate eachreplacement kit prior to assembly, into the drive shaft yokes.Each journal cross lube reservoir should be fully packed witha recommended grease and each bearing assembly shouldalso be wiped with the same grease; filling all the cavitiesbetween the rollers and applying a liberal grease coating onthe bottom of each race. After the kits are installed into thedriveshaft yokes and prior to placing into service, they shouldbe relubed, through the zerks, using the same grease.LUBRICANTFor center bearings, slip joints and universal jointsuse IH 251 HEP grease or equivalent NLGI #2 multi-purposegrease.RELUBE CYCLESRelubrication cycles for driveshaft universal jointsand slip splines will vary with service requirements andoperating conditions. Refer to Operator's Manual.SLIP JOINT LUBRICATIONRelube spline at intervals prescribed in Operator'sManual. Apply grease gun pressure to lubrication zerk untillubricant appears at pressure relief hole in welch plug atsleeve yoke end of spline (Fig. 11). At this point, coverpressure relief hole with finger and continue to apply pressureuntil grease appears at sleeve yoke seal (Fig. 12). This willinsure complete lubrication of spline.CTS-2730 Page 10PRINTED IN UNITED STATES OF AMERICA